Add the ability to use bscscan

README.md

@@ -21,7 +21,10 @@ import (
 func main() {
 	// create a API client for specified ethereum net
 	// there are many pre-defined network in package
-	client := etherscan.New(etherscan.Mainnet, "[your API key]")
+	client := etherscan.New(etherscan.Mainnet, "[your api key]")
+
+	// Alternatively, to use bscscan.com for bsc transactions, use:
+	// client := etherscan.New(etherscan.Mainnet, "[your api key]", etherscan.WithChain(etherscan.ChainBsc))
 
 	// (optional) add hooks, e.g. for rate limit
 	client.BeforeRequest = func(module, action string, param map[string]interface{}) error {

client.go

@@ -38,16 +38,36 @@ type Client struct {
 	AfterRequest func(module, action string, param map[string]interface{}, outcome interface{}, requestErr error)
 }
 
+type Option struct {
+	chain Chain
+}
+
+type ClientOption func(o *Option)
+
+func WithChain(chain Chain) ClientOption {
+	return func(o *Option) {
+		o.chain = chain
+	}
+}
+
 // New initialize a new etherscan API client
 // please use pre-defined network value
-func New(network Network, APIKey string) *Client {
+func New(network Network, APIKey string, opts ...ClientOption) *Client {
+	option := Option{
+		chain: ChainEthereum,
+	}
+
+	for _, opt := range opts {
+		opt(&option)
+	}
+
 	return &Client{
 		coon: &http.Client{
 			Timeout: 30 * time.Second,
 		},
 		network: network,
 		key:     APIKey,
-		baseURL: fmt.Sprintf(`https://%s.etherscan.io/api?`, network.SubDomain()),
+		baseURL: fmt.Sprintf(string(option.chain), network.SubDomain()),
 	}
 }
 

network.go

@@ -20,8 +20,13 @@ const (
 	Rinkby Network = "api-rinkeby"
 	// Tobalaba Testnet
 	Tobalaba Network = "api-tobalaba"
+
+	ChainEthereum Chain = "https://%s.etherscan.io/api?"
+	ChainBsc Chain = "https://%s.bscscan.com/api?"
 )
 
+type Chain string
+
 // Network is ethereum network type (mainnet, ropsten, etc)
 type Network string